Three dimensional stereoscopic image display apparatus

ABSTRACT

The present invention is to provide a three dimensional stereoscopic image display apparatus that comprises an image display panel portion in which a plurality of left eye image pixels and a plurality of right eye image pixels are alternately disposed; a first polarizing plate disposed in front of the image display panel portion; and a second polarizing plate disposed in front of the first polarizing plate, wherein the first polarizing plate comprises a plurality of first left eye image polarizers which correspond to the plurality of the left eye image pixels and a plurality of first right eye image polarizers which correspond to the plurality of the right eye image pixels, and wherein the second polarizing plate comprises a second left eye image polarizing portion and a second right eye image polarizing portion.

FIELD OF THE INVENTION

The present invention relates to a three dimensional stereoscopic imagedisplay apparatus, and more particularly, to a three dimensionalstereoscopic image display apparatus using polarizing plates.

BACKGROUND OF THE INVENTION

The first stereoscopic display technology was introduced by CharlesWheatstone in 1836 in England. Along with the development in photographytechnology, the stereoscopic image technologies using the parallaxbarrier and the lenticular lens have been improved rapidly in 20thcentury. A new concept of three dimensional image display, that is,hologram technology, was also invented in the middle of the century.Recently, many other approaches have been used for the three dimensionalimage display, such as anaglyph, polarizer goggles, shutter-glasses, andhead-mount set for virtual reality. Each technology has its own benefitsand problems at the same time.

The hologram technology has not yet directly applicable to the currentdigital image technology of which resolution is much crude. The methodswith glasses such as anaglyph, polarizer glasses, that ismshutter-glasses have been not generally well received in the artsbecause of inconvenience, and some potential health problems (dizziness,vomiting, etc).

Therefore, the stereoscopic display technology which does not need anyspecial glasses, so called auto-stereoscopy, has been a hot topic in thearts. There are two well-known technologies available for theauto-stereoscopy: lenticular lens method and parallax barrier method.The lenticular method uses an array of multiple cylindrical lenses infront of the image display panel. The parallax barrier method uses anarray of multiple dark stripes in front of the image display panel.

Recently, these methods have been popular thanks to the TFT-LCD (ThinFilm Transistor—Liquid Crystal Display) technology. Many parallaxbarrier types of 3D stereoscopic image display apparatus combined withthe TFT LCD technology has been proposed.

Now, the conventional parallax barrier type of 3D stereoscopic imagedisplay apparatus will be explained in order to understand the presentinvention. FIGS. 3 a and 3 b are view illustrating constructions of theconventional parallax barrier type of a 3D stereoscopic image displayapparatus. As shown in FIGS. 3 a and 3 b, the parallax barriers 400comprising multiple parallel dark bars are disposed in front of theimage display panel 300. The parallax barriers 400 which are dark barsshield or block the light beams from left (right) images which entersright eye. The dotted lines denote the shielded light beams. The slitsbetween the parallax barriers, that is, the space between barriers,guide or pass the light beams for the left right eyes to see the leftand right eye images, respectively. The solid lines denote the passedlight beams. Therefore, a viewer will perceive only part of images onthe image display panel 300 due to the parallax barriers 400. FIG. 3 bshows only the viewable light beams. Hence, the viewer's left eye canonly see the left eye images, while his right eye see the right eyeimage only. The viewer will see a 3D effect due to binocular vision.This method is simple and can be implemented easily even with file mask.

Benefit of the parallax barrier method is the fact that it does notrequire any special glasses.

However, a viewer can see three dimensional image only in a specificzone, as drawn in the figures, and can not see the three dimensionalimage if the viewer is out of the viewer zone.

Another problem is the fact that the resolution of the image becomeshalf (half for left eye image, and another half for right eye image).

Now, a conventional method using polarizing glasses will be described.FIGS. 4 a and 4 b are schematic diagrams illustrating a conventionalthree dimensional image display with polarizing glasses. As shown inFIG. 4 a, an array of polarizer panel 100 is placed in front of theimage display panel 300, where polarizers with −45 degree angle areplaced on the left eye images while −45 degree polarizers are on theright eye images. The viewer wears a pair of polarizer glasses 500,where lens for left eye has its polarization angle of 45 degree and lensfor right eye has its polarization angle of −45 degree. In FIG. 4 a,solid lines represent viewable light beams which are passed through thepolarizing filters (lenses), while dotted lines represent the blockedlight beams due to polarizer setup. Therefore, the viewer can only seethe light beams shown in the FIG. 4 b, and see the three dimensionalimage due to the binocular vision.

Benefit of the polarizer glasses method is the fact that the viewer cansee three dimensional image in any place in front of the display.

However, wearing such glasses result some inconvenience for the viewer.Following some ergonomical issues, problems with dizziness or vomitingwere reported.

Another crucial inconvenience is that the viewer has to put on and offthe glasses when he wants to see two dimensional images and threedimensional images together.

SUMMARY OF THE INVENTION

The object of the present invention is to solve the above problems inthe convention technique.

An aspect of the present invention is to provide a three dimensionalstereoscopic image display apparatus that comprises an image displaypanel portion in which a plurality of left eye image pixels and aplurality of right eye image pixels are alternately disposed; a firstpolarizing plate disposed in front of the image display panel portion;and a second polarizing plate disposed in front of the first polarizingplate, wherein the first polarizing plate comprises a plurality of firstleft eye image polarizers which correspond to the plurality of the lefteye image pixels and a plurality of first right eye image polarizerswhich correspond to the plurality of the right eye image pixels, andwherein the second polarizing plate comprises a second left eye imagepolarizing portion and a second right eye image polarizing portion.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the second left eyeimage polarizing element comprises a second left eye image transparentpolarizer for passing light directed from the first left eye imagepolarizers to the left eye; and a second left eye image shieldingpolarizer for shielding light directed from the first left eye imagepolarizers to the right eye, and wherein the second right eye imagepolarizing portion comprises a second right eye image shieldingpolarizer for shielding light directed from the first right eye imagepolarizers to the left eye; and a second right eye image transparentpolarizer for passing light directed from the first right eye imagepolarizers to the right eye.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the first left eye imagepolarizer and the second left eye image polarizing element have a firstpolarization angle, the first right eye image polarizer and the secondright eye image polarizing portion have a second polarization angle, andthe phase difference between the first and second polarization angles is90 degree.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the first left eye imagepolarizer, the second left eye image transparent polarizer, and thesecond right eye image shielding polarizer has a first polarizationangle, the first right eye image polarizer, the second left eye imageshielding polarizer, and the second right eye transparent polarizer hasa second polarization angle, and the phase difference between the firstand second polarization angles is 90 degree.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the first polarizationangle is 45 degree, and the first polarization angle is −45 degree.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the first polarizingplate and the second polarizing plat angle is able to be changed betweenan active state and an inactive state.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the second polarizingplate is formed with a twisted nematic (TN) liquid crystal device.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the image display panelportion is constructed with a liquid crystal display panel.

In the three dimensional stereoscopic image display apparatus accordingto the present invention, it is preferable that the image display panelportion is constructed with a plasma display panel.

BRIEF DESCRIPTION OF THE DRAWINS

The above and other objects, advantages and features of the presentinvention will become apparent from the following description ofpreferred embodiments given in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a perspective view illustrating a three dimensionalstereoscopic image display apparatus according to the present invention;

FIG. 2 a is a schematic diagram for explaining operations of a firstpolarizing plate and a second polarizing plate in the three dimensionalstereoscopic image display apparatus of the present invention shown inFIG. 1;

FIG. 2 b is a schematic diagram for explaining operations of a firstpolarizing plate and a second polarizing plate in the three dimensionalstereoscopic image display apparatus of the present invention shown inFIG. 1;

FIG. 3 a is a view illustrating a conventional parallax barrierstereoscopic image display apparatus;

FIG. 3 b is a view illustrating a conventional parallax barrierstereoscopic image display apparatus;

FIG. 4 a is a view for explaining the principle of a conventionalpolarizing goggle stereoscopic image display apparatus; and

FIG. 4 b is a view for explaining the principle of a conventionalpolarizing goggle stereoscopic image display apparatus.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Now, the preferred embodiments according to the present invention willbe described in details with reference to the accompanying drawings.

[First Embodiment]

FIG. 1 is a view illustrating an embodiment of the present invention. Asshown in FIG. 1, the three dimensional stereoscopic image displayapparatus according to an embodiment of the present invention comprisesan image display panel portion 300, a first polarizing plate 100disposed in front of the image display panel portion 300, and a secondpolarizing plate 200 disposed in front of the first polarizing plate100.

In the image display panel portion 300, a plurality of left eye imagepixels L and a plurality of right eye image pixels R are alternatelydisposed. One image which is formed by the left eye image pixels L isperceived with the left eye, and the other image which is formed by theright eye image pixels R is perceived with the right eye. The imagedisplay panel portion 300 is constructed with, for example, a liquidcrystal display panel. In another embodiment of the present invention,the image display panel portion 300 may be constructed with a plasmadisplay panel, an organic electroluminescence (EL) display panel, or aCRT display apparatus.

In the image display panel portion 300, the left eye image pixels L andthe right eye image pixels R are disposed in a shape of a matrix. Inother words, the left eye image pixels L and the right eye image pixelsR are disposed alternately in the horizontal direction. In the verticaldirection, the same type of image pixels are aligned so that the leftand right eye image pixels L, R can be alternately formed in two typesof strips.

FIG. 2 a is a schematic diagram for explaining operations of a firstpolarizing plate and a second polarizing plate in the three dimensionalstereoscopic image display apparatus of the present invention shown inFIG. 1. In FIG. 2 a, solid lines denote the light beams which reach theleft and right eyes by operations of the first and second polarizingplates 100, 200. Dotted lines denote the light beans which are not ableto reach the left and right eyes by other operations of the first andsecond polarizing plates 100, 200. These operations of the first andsecond polarizing plates are described later.

Referring to FIG. 2 a, the first polarizing plate 100 which is disposedin front of the image display panel portion 300 comprises a plurality offirst left eye image polarizers 110 and a plurality of first right eyeimage polarizers 120. The plurality of the first left eye imagepolarizers 110 and the plurality of the first right eye image polarizers120 are disposed corresponding to the left eye image pixels L and theright eye image pixels R, respectively. The number of the first left eyeimage polarizers 110 is identical to that of the left eye image pixelsL, and the number of the first right eye image polarizers 120 isidentical to that of the right eye image pixels R.

The first left eye image polarizers 110 polarizes the light beams whichare emitted from the left eye image pixels L into light beams with apredetermined polarization angle. The first right eye image polarizers120 polarizes the light beams which are emitted from the right eye imagepixels R into light beams with a predetermined polarization angle havingphase difference of 90 degree with the polarization angle of the firstleft eye image polarizers 110. Preferably, in the embodiment of thepresent invention, the polarization angle of the first left eye imagepolarizers 110 is 45 degree and the polarization angle of the firstright eye image polarizers 110 is −45 degree. However, any polarizationangles may be selected if the difference between the first left eyeimage polarizers 110 and the first right eye image polarizers 120 is 90degree. Therefore, the present invention is not limited to theaforementioned specific angles.

On the other hand, it is preferable that the first polarizing plate 100is appropriately close to he the image display panel portion 300 so thatthe light beams emitted form the left eye image pixels L may not enterthe first left eye image polarizers 110 and the light beams emitted fromthe left eye image pixels L may not enter the first right eye imagepolarizers 120. By doing so, the separation of the left and right eyeimages is ensured, so that an viewer may perceive the stereoscopic imageaccurately.

The 45 degree polarized light beam from the first left eye imagepolarizers 110 of the first polarizing plate and the −45 degreepolarized light beams from the first right eye image polarizers 120 ofthe first polarizing plate are incident on the second polarizing plate200. The second polarizing plate 200 has functions of passing orshielding the light beams.

The second polarizing plate 200 comprises second left eye imagepolarzing elements and second right eye image polarizing elements. Thesecond left eye image polarzing elements pass or shield the light beamsemitted from the left eye image pixels L. Similarly, the second righteye image polarzing elements pass or shield the light beams emitted fromthe right eye image pixels L. The number of the second left eye imagepolarzing elements is identical to that of the first left eye imagepolarizers 110 and the second right eye image polarizing elements isidentical to that of the first right eye image polarizers 120.

Furthermore, each of the second left eye image polarzing elementscomprises a second left eye image transparent polarizer 210 and a secondright eye image shielding polarizer 211. Similarly, each of the secondright eye image polarzing elements comprises a second right eye imagetransparent polarizer 220 and a second right eye image shieldingpolarizer 221.

As shown in FIG. 2 a, each of the second left eye image polarzingelements comprises two polarizers 210, 211 which pass or shield thelight beam emitted from the first left eye image polarizers 100 from thefirst polarizing plate 100.

The second left eye image transparent polarizer 210 has a function ofpassing the light beam emitted from the first left eye image polarizers110 to the left eye so that the left eye image can reach the left eye ofthe viewer. The polarization angle of the second left eye imagetransparent polarizer 210 is the same as that of the first left eyeimage polarizer in order to pass the light beam emitted from the firstleft eye image polarizer. As described above, since the polarizationangle of the first polarizing plate is 45 degree in the embodiment, Thepolarization angle of the second left eye image transparent polarizer210 is 45 degree.

The second left eye image shielding polarizer 211 has a function ofshielding the light beam emitted from the first left eye imagepolarizers 110 to the right eye so that the left eye image can not enterthe right eye. The polarization angle of the second left eye imageshielding polarizer 211 has the phase difference of 90 degree to that ofthe first left eye image polarizer in order to shield the light beamemitted from the first left eye image polarizer to the right eye.Therefore, the polarization angle of the second left eye image shieldingpolarizer 211 is −45 degree in the embodiment.

As shown in FIG. 2 b, each of the second right eye image polarzingelements comprises two polarizers 220, 221 which pass or shield thelight beam emitted from the first right eye image polarizers 120 fromthe first polarizing plate 100.

The second right eye image shielding polarizer 220 has a function ofshielding the light beam emitted from the first right eye imagepolarizers 120 to the left eye so that the right eye image can not enterthe left eye. The polarization angle of the second right eye imageshielding polarizer 220 has the phase difference of 90 degree to that ofthe first right eye image polarizer in order to shield the light beamemitted from the first right eye image polarizer to the left eye.Therefore, the polarization angle of the second right eye imageshielding polarizer 220 is 45 degree in the embodiment.

The second right eye image transparent polarizer 221 has a function ofpassing the light beam emitted from the first right eye image polarizers120 to the right eye so that the right eye image can reach the right eyeof the viewer. The polarization angle of the second right eye imagetransparent polarizer 210 is the same as that of the first right eyeimage polarizer in order to pass the light beam emitted from the firstright eye image polarizer. Therefore, the polarization angle of thesecond right eye image transparent polarizer 221 is −45 degree.

In the second polarizing plate 200, the positions of the second left eyeimage transparent polarizer 210, the second left eye image shieldingpolarizer 211, the second right eye image shielding polarizer 220 andthe second right eye image transparent polarizer 221 and their spacingmay be varied in accordance with the design of the apparatus withoutdeparting from the principle of the present invention.

Referring to FIG. 2 a, the polarizers are disposed in the sequence ofthe second left eye image transparent polarizer 210, the second left eyeimage shielding polarizer 211, the second right eye image shieldingpolarizer 220 and the second right eye image transparent polarizer as aone set. However, the present invention is not limited to the sequence.If the polarizers are disposed at positions which are located toward theviewer from the intersection near the pixels In FIG. 2 a, the set offour polarizers may be disposed in the other sequence of the second lefteye image transparent polarizer 210, the second right eye imageshielding polarizer 220, the second left eye image shielding polarizer211, and the second right eye image transparent polarizer. Even in themodified arrangement, it is possible to obtain the effects of thepresent invention.

According to the embodiment, the separation of the left and right eyeimages in the image display panel portion is ensured, so that an viewermay perceive the stereoscopic image accurately.

In addition, according to the present invention, the change betweenthree dimensional (3D) image display and two dimensional (2D) imagedisplay can be performed. In the conventional apparatus, the changebetween 3D and two dimensional image display is difficult. For example,in a goggle type apparatus, goggles have to be taken off in order toperceive the two dimensional image.

The apparatus according to the present invention is applicable to astereoscopic display device which displays the three dimensional imageand the two dimensional image at the same time on the same screen.

According to the present invention, it is possible to solve the problemsthat the resolution is reduced in half in the conventional parallaxbarrier type apparatus.

According to the present invention, it is possible to avoid the viewer'sdizziness or vomiting that are the problems of the polarizer glassesmethods.

[Second Embodiment]

In the second embodiment of the present invention, the aforementionedconstruction of the three dimensional stereoscopic image displayapparatus of the first embodiment is incorporated, and particularly, thefirst polarizing plate and the second polarizing plate are constructedto be changed between an active state and an inactive state.

Here, the inactive state of the polarizing plate is that the polarizingplate does not polarize the light beams and the active state of thepolarizing plate is that the polarizing plate polarizes the light beams.

The apparatus with the polarizing plates that are able to be changedbetween the active and inactive states according to the secondembodiment of the present invention improves the applicability of thethree dimensional stereoscopic image display apparatus.

Firstly, in a mode that the first polarizing plate is in the activestate and the second polarizing plate is in the inactive state, theassociated construction is identical to that of the first embodiment asdescribed above. Therefore, the description on the apparatus in thismode is omitted.

Next, in a mode that both of the first and second polarizing plates arein the inactive states and the left eye image pixels or the right eyeimage pixels are selectively activated, the viewer perceives not thethree dimensional stereoscopic image but the two dimensional image. Inthe mode capable of displaying two dimensional image, the work fordocument is suitable. According to the second embodiment, it is possibleto display the three dimensional image and the two dimensional imageselectively.

Next, in a mode that the first polarizing plates are in the active stateand the second polarizing plate are in the inactive state, the sameimage as the conventional polarizing glasses method can be obtained. Inthe mode, the viewer can perceive the stereoscopic image with glasses.Even though the polarizing glasses methods have some problems such asdizziness, the methods have that unique advantage that the stereoscopicimage can be seen at any viewing direction. In this mode, it is possibleto obtain the same advantage as the polarizing glasses methods.

According to the second embodiment of the present invention, it ispossible to obtain the same advantages as those of the parallax barriertype and the polarizing glasses method by selecting the aforementionedmodes.

INDUSTRIAL APPLICALBILTY

According to the three dimensional stereoscopic image display apparatusof the present invention, it is possible to solve the problems that theresolution is reduced in half in the conventional parallax barrier typeapparatus.

According to the three dimensional stereoscopic image display apparatusof the present invention, it is possible to obtain the same advantagesas those of the parallax barrier type and the polarizing glasses methodby selecting or changing the modes.

According to the three dimensional stereoscopic image display apparatusof the present invention, it is possible to obtain the same advantagesas those of the parallax barrier type and the polarizing glasses methodby selecting or changing the modes

According to the three dimensional stereoscopic image display apparatusof the present invention, it is possible to avoid some inconvenience forthe viewer due to putting on and off glasses in the conventionalpolarizing glasses method. In addition, it is possible to avoid theviewer's dizziness or vomiting in the polarizer glasses methods.

According to the three dimensional stereoscopic image display apparatusof the present invention, it is possible to display the threedimensional image and the two dimensional image at the same time on thesame screen.

In the three dimensional stereoscopic image display apparatus of thepresent invention, it is preferable that the second polarizing plate isconstructed with a twisted nematic liquid crystal display device, sincethe twisted nematic liquid crystal device is able to be changed betweenthe aforementioned active and inactive states and has polarization.However, the present invention is not limited to the twisted nematicliquid crystal device.

In the three dimensional stereoscopic image display apparatus of thepresent invention, it is preferable that the image display panel portionis constructed with, for example, a liquid crystal display panel.However, the image display panel portion may be constructed with aplasma display panel, an organic electroluminescence (EL) display panel,or a CRT display apparatus without departing from the spirit and scopeof the present invention.

Although the present invention and its advantages have been described indetails, it should be understood that the present invention is not limitto the aforementioned embodiment and the accompanying drawings and itshould be understood that various changes, substitutions and alterationscan be made herein by the skilled in the arts without departing from thesprit and the scope of the present invention as defined by the appendedclaims.

1. A three dimensional stereoscopic image display apparatus, comprising:an image display panel portion in which a plurality of left eye imagepixels and a plurality of right eye image pixels are alternatelydisposed; a first polarizing plate disposed in front of the imagedisplay panel portion; and a second polarizing plate disposed in frontof the first polarizing plate, wherein the first polarizing platecomprises a plurality of first left eye image polarizers whichcorrespond to the plurality of the left eye image pixels and a pluralityof first right eye image polarizers which correspond to the plurality ofthe right eye image pixels, and wherein the second polarizing platecomprises a second left eye image polarizing portion and a second righteye image polarizing portion.
 2. A three dimensional stereoscopic imagedisplay apparatus according to claim 1, wherein the second left eyeimage polarizing element comprises a second left eye image transparentpolarizer for passing light directed from the first left eye imagepolarizers to the left eye; and a second left eye image shieldingpolarizer for shielding light directed from the first left eye imagepolarizers to the right eye, and wherein the second right eye imagepolarizing portion comprises a second right eye image shieldingpolarizer for shielding light directed from the first right eye imagepolarizers to the left eye; and a second right eye image transparentpolarizer for passing light directed from the first right eye imagepolarizers to the right eye.
 3. A three dimensional stereoscopic imagedisplay apparatus according to claim 1, wherein the first left eye imagepolarizer and the second left eye image polarizing element have a firstpolarization angle, wherein the first right eye image polarizer and thesecond right eye image polarizing portion have a second polarizationangle, and wherein the phase difference between the first and secondpolarization angles is 90 degree.
 4. A three dimensional stereoscopicimage display apparatus according to claim 2, wherein the first left eyeimage polarizer, the second left eye image transparent polarizer, andthe second right eye image shielding polarizer has a first polarizationangle, wherein the first right eye image polarizer, the second left eyeimage shielding polarizer, and the second right eye transparentpolarizer has a second polarization angle, and wherein the phasedifference between the first and second polarization angles is 90degree.
 5. A three dimensional stereoscopic image display apparatusaccording to claim 3, wherein the first polarization angle is 45 degree,and wherein the first polarization angle is −45 degree.
 6. A threedimensional stereoscopic image display apparatus according to claim 4,wherein the first polarization angle is 45 degree, and wherein the firstpolarization angle is 45 degree.
 7. A three dimensional stereoscopicimage display apparatus according to any one of claims 1 to 6, whereinthe first polarizing plate and the second polarizing plat angle is ableto be changed between an active state and an inactive state.
 8. A threedimensional stereoscopic image display apparatus according to any one ofclaims 1 to 6, wherein the second polarizing plate is formed with atwisted nematic (TN) liquid crystal device.
 9. A three dimensionalstereoscopic image display apparatus according to any one of claims 1 to6, wherein the image display panel portion is constructed with a liquidcrystal display panel.
 10. A three dimensional stereoscopic imagedisplay apparatus according to any one of claims 1 to 6, wherein theimage display panel portion is constructed with a plasma display panel.11. A goggle non-goggle convertible stereoscopic image display systemcomprising a three dimensional stereoscopic image display apparatusaccording to any one of claims 1 to 6,
 12. A goggle non-goggleconvertible stereoscopic image display system comprising a threedimensional stereoscopic image display apparatus according to any one ofclaims
 7. 13. A goggle non-goggle convertible stereoscopic image displaysystem comprising a three dimensional stereoscopic image displayapparatus according to any one of claims
 8. 14. A goggle non-goggleconvertible stereoscopic image display system comprising a threedimensional stereoscopic image display apparatus according to any one ofclaims
 9. 15. A goggle non-goggle convertible stereoscopic image displaysystem comprising a three dimensional stereoscopic image displayapparatus according to any one of claims
 10. 16. A three-dimensionaltwo-dimensional convertible stereoscopic image display system comprisinga three dimensional stereoscopic image display apparatus according toany one of claims 1 to 6,
 17. A three-dimensional two-dimensionalconvertible stereoscopic image display system comprising a threedimensional stereoscopic image display apparatus according to any one ofclaims
 7. 18. A three-dimensional two-dimensional convertiblestereoscopic image display system comprising a three dimensionalstereoscopic image display apparatus according to any one of claims 8.19. A three-dimensional two-dimensional convertible stereoscopic imagedisplay system comprising a three dimensional stereoscopic image displayapparatus according to any one of claims
 9. 20. A three-dimensionaltwo-dimensional convertible stereoscopic image display system comprisinga three dimensional stereoscopic image display apparatus according toany one of claims 10.